A Fieldbus is a digital, serial, two-way, multi-drop communication link among controllers and its remote I/O, sensors, actuators and inter-networking components.

PROFIBUS is the world‘s most successful fieldbus with an installed base of nearly hundred million devices in factory automation and process industry applications.
Utilizing a single, consistent, application-independent communication protocol, PROFIBUS supports fieldbus solutions both in factory and process automation as well as in motion control and safety-related tasks.